What are mixtures that have evenly mixed groups of particles that do not settle out called? colloidsheterogeneous mixtureshomogenous mixtures?

step 1: nitrogen fixation- conversion of atmospheric no₂ into forms useful to plants by lightning, bacteria, and cyanobacteria.

step 2: nitrification-process of converting ammonia to nitrite or nitrate.

step 3: assimilation-plant roots absorb new form of nitrogen.

step 4: ammonification-conversion of organic nitrogen to ammonia by bacteria involved in decomposition.

step 5: denitrification-bacteria turns the decomposed matter back into n₂o, which is released into atmosphere; repeat cycle.

answer: substrate concentration. enzymes work best when there is a high enough substrate concentration for the reaction they catalyse.

b a mature ovary of a plant.